Abstract
Abstract The flow characteristics of angel O/W emulsion, which is a yield stress fluid, was investigated. The hysteresis loop test was conducted for the strain below the slip yield point, and the single relaxation Maxwell model was used to fit the experimental data. Using these methods, the shear-rate dependence, stress dependence, and time dependence of the viscoelastic properties of the sample were evaluated in the region below the slip yield point. The shear-rate dependence induced by the stress-ramp rate and the stress dependence from the maximum applied stress influence the viscoelastic characteristics below the slip yield point in terms of the flow history. However, the time dependence of the viscoelastic characteristics could not be confirmed for any creep time. The yield stress measured in the stress-ramp test increases with the stress-ramp rate owing to the contribution of the viscous strain from the flow history.
Highlights
Yield stress fluids are a kind of fluid defined by Bingham in 1922 [1]
We conducted a hysteresis loop test and a stress-ramp test to investigate the influence of the flow characteristics below the slip yield point, and the relationship between the flow characteristics and the slip yield
Since the flow history is below the slip yield stress, the viscosity in the decreasing stress segment is close to that in the increasing stress segment at a high stress-ramp rate
Summary
Yield stress fluids are a kind of fluid defined by Bingham in 1922 [1] Research on such fluids has not been very popular until recently. When the steady viscoelastic test is performed on such fluids, the results under which the shear-rate increases or decreases are completely consistent. When the steady viscoelastic test is performed on these fluids, the results under which the shear-rate increases or decreases are not consistent. The viscosity is a function of the shear-rate and of the accumulated strain, applied stress, and static time. This effect is called the flow history. The flow history affects the rheological behavior of thixotropic fluids because the
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